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Debt (Tables)
 9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Short-term and long-term debt outstanding
(in millions)
September 30,
2013
 
December 31,
2012
5.9% Senior Notes, due 2017 1
$
400

 
$
400

6.55% Senior Notes, due 2037 2
399

 
399

Commercial paper
—

 
457

Total debt
799

 
1,256

Less: short-term debt including current maturities
—

 
457

Long-term debt
$
799

 
$
799

1 
Interest payments are due semiannually on April 15 and October 15, and, as of September 30, 2013, the unamortized debt discount is $0.4 million.
2 
Interest payments are due semiannually on May 15 and November 15, and, as of September 30, 2013, the unamortized debt discount is $1.3 million.